Product Advisories

Thank you for using Canon products.

It has been confirmed that, even when the lock screw for the lens hood on the Lenses is fastened, the lens hood may rotate when a certain amount of pressure is applied, but it will not detach from the lens. As a result, some specifications for the lens hood have been changed to address this phenomenon.
For customers who may be inconvenienced by this phenomenon during shooting and would like to request a lens hood exchange, please contact the Canon Customer Support center in your region. The details are as follows.

SupportFor customers who would like to request a lens hood, please
contact your nearest Canon Customer Support center for a lens hood free of
charge.

This information is for residents of the United States and Puerto Rico only.
If you do not reside in the USA or Puerto Rico, please contact the Canon
Customer Support Center in your region. Please
register your
EF300mm f/2.8L IS II USM and
register your EF400mm f/2.8L IS II USM. By registering, we will be able to notify you via email when future firmware updates become available for download. If you already registered, please ensure you are opted-in to receive the notification.